FR2298879A1 - Mixed barium-strontium-calcium oxide cathode coating material - contg. much less barium and less strontium oxide, reducing volatility - Google Patents

Mixed barium-strontium-calcium oxide cathode coating material - contg. much less barium and less strontium oxide, reducing volatility

Info

Publication number
FR2298879A1
FR2298879A1 FR7502081A FR7502081A FR2298879A1 FR 2298879 A1 FR2298879 A1 FR 2298879A1 FR 7502081 A FR7502081 A FR 7502081A FR 7502081 A FR7502081 A FR 7502081A FR 2298879 A1 FR2298879 A1 FR 2298879A1
Authority
FR
France
Prior art keywords
strontium
barium
less
coating material
contg
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR7502081A
Other languages
French (fr)
Other versions
FR2298879B1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to FR7502081A priority Critical patent/FR2298879A1/en
Publication of FR2298879A1 publication Critical patent/FR2298879A1/en
Application granted granted Critical
Publication of FR2298879B1 publication Critical patent/FR2298879B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/14—Solid thermionic cathodes characterised by the material
    • H01J1/142—Solid thermionic cathodes characterised by the material with alkaline-earth metal oxides, or such oxides used in conjunction with reducing agents, as an emissive material

Landscapes

  • Solid Thermionic Cathode (AREA)
  • Discharge Lamp (AREA)

Abstract

The cathode oxide coating material contains 1-20 mole % BaO, 30-50 mole % SrO and 40-65 mole % CaO. The coated anodes are used e.g. in amplifier and transmitting tubes. Volatilisation of the oxide coating material is greatly reduced, whilst a high emissivity is retained, i.e. a low work function is ensured, by the use of more CaO, much less BaO and less SrO than usual. The volatility is 0.08-0.2 units at 1050K, i.e. 5-12 times less than usual, whilst the work function remains at 1.50-1.65 eV. The drop in emission is only 20-35% in 5000 h operation (cf. ca 50% for the usual material contg. equimolar amts. of BaO and SrO and up to 13 mole % CaO).
FR7502081A 1975-01-23 1975-01-23 Mixed barium-strontium-calcium oxide cathode coating material - contg. much less barium and less strontium oxide, reducing volatility Granted FR2298879A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7502081A FR2298879A1 (en) 1975-01-23 1975-01-23 Mixed barium-strontium-calcium oxide cathode coating material - contg. much less barium and less strontium oxide, reducing volatility

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7502081A FR2298879A1 (en) 1975-01-23 1975-01-23 Mixed barium-strontium-calcium oxide cathode coating material - contg. much less barium and less strontium oxide, reducing volatility

Publications (2)

Publication Number Publication Date
FR2298879A1 true FR2298879A1 (en) 1976-08-20
FR2298879B1 FR2298879B1 (en) 1977-10-21

Family

ID=9150226

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7502081A Granted FR2298879A1 (en) 1975-01-23 1975-01-23 Mixed barium-strontium-calcium oxide cathode coating material - contg. much less barium and less strontium oxide, reducing volatility

Country Status (1)

Country Link
FR (1) FR2298879A1 (en)

Also Published As

Publication number Publication date
FR2298879B1 (en) 1977-10-21

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Legal Events

Date Code Title Description
ST Notification of lapse